Eh, so it seems teams are in early. Price won't change until after GW1, right?
Definitely need to rethink a lot of things with Mbeumo in United (and actually now he's a striker?) Didn't dig too deep in it yet but I hope they keep things as much as possible similar. Hard to get over the learning curve in the first place, never mind tweaks and changes etc. Leeds has to be where the value is, is my initial thought.
Prices are locked until the game starts so you are good on that front. Only way you can profit by making a squad early is to target a player that will make a move to the team that you want to have a lot of players from. Let's say in your case you already have 3 LFC players and you hear Palmer is coming to red side. You take him before the transfer is official and you have 4 Liverpool players until the moment you transfer one of them out.